David Woolley wrote:
> Depends on interrupt latency, network loading, the total lack of any 
> Windows machines in the time synchronisation chain, etc.  100ns should 
> be possible for lightly loaded machines on a lightly loaded network, at 
> least 90% of the time.

Sorry.  I got 100 microseconds and 100 ns mixed up. However, whilst 100 
microseconds is rather easier to achieve, if you want 100% reliability, 
I still think the common PPS line would be advisable.  Caveats about 
Windows still apply.

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